159 lines
3.9 KiB
C++
159 lines
3.9 KiB
C++
/*
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* Copyright (c) 2016 MariaDB Corporation Ab
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file and at www.mariadb.com/bsl11.
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*
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* Change Date: 2022-01-01
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2 or later of the General
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* Public License.
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*/
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/**
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* @file A MySQL Group Replication cluster monitor
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*/
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#define MXS_MODULE_NAME "grmon"
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#include "grmon.hh"
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#include <new>
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#include <string>
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#include <maxscale/protocol/mysql.h>
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#include <mysqld_error.h>
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GRMon::GRMon(MXS_MONITOR* monitor)
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: MonitorInstanceSimple(monitor)
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{
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}
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GRMon::~GRMon()
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{
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}
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GRMon* GRMon::create(MXS_MONITOR* monitor)
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{
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return new GRMon(monitor);
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}
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bool GRMon::has_sufficient_permissions() const
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{
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return true;
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}
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static inline bool is_false(const char* value)
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{
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return strcasecmp(value, "0") == 0
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|| strcasecmp(value, "no") == 0
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|| strcasecmp(value, "off") == 0
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|| strcasecmp(value, "false") == 0;
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}
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static bool is_master(MXS_MONITORED_SERVER* server)
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{
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bool rval = false;
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MYSQL_RES* result;
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const char* master_query =
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"SELECT VARIABLE_VALUE, @@server_uuid, @@read_only FROM performance_schema.global_status "
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"WHERE VARIABLE_NAME= 'group_replication_primary_member'";
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if (mysql_query(server->con, master_query) == 0 && (result = mysql_store_result(server->con)))
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{
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for (MYSQL_ROW row = mysql_fetch_row(result); row; row = mysql_fetch_row(result))
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{
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if (strcasecmp(row[0], row[1]) == 0 && is_false(row[2]))
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{
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rval = true;
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}
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}
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mysql_free_result(result);
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}
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else
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{
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mon_report_query_error(server);
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}
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return rval;
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}
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static bool is_slave(MXS_MONITORED_SERVER* server)
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{
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bool rval = false;
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MYSQL_RES* result;
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const char slave_query[] = "SELECT MEMBER_STATE FROM "
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"performance_schema.replication_group_members "
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"WHERE MEMBER_ID = @@server_uuid";
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if (mysql_query(server->con, slave_query) == 0 && (result = mysql_store_result(server->con)))
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{
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for (MYSQL_ROW row = mysql_fetch_row(result); row; row = mysql_fetch_row(result))
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{
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if (strcasecmp(row[0], "ONLINE") == 0)
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{
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rval = true;
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}
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}
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mysql_free_result(result);
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}
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else
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{
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mon_report_query_error(server);
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}
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return rval;
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}
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void GRMon::update_server_status(MXS_MONITORED_SERVER* monitored_server)
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{
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if (is_master(monitored_server))
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{
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monitor_set_pending_status(monitored_server, SERVER_MASTER);
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monitor_clear_pending_status(monitored_server, SERVER_SLAVE);
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}
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else if (is_slave(monitored_server))
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{
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monitor_set_pending_status(monitored_server, SERVER_SLAVE);
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monitor_clear_pending_status(monitored_server, SERVER_MASTER);
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}
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else
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{
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monitor_clear_pending_status(monitored_server, SERVER_SLAVE);
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monitor_clear_pending_status(monitored_server, SERVER_MASTER);
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}
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}
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/**
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* The module entry point routine. It is this routine that
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* must populate the structure that is referred to as the
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* "module object", this is a structure with the set of
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* external entry points for this module.
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*
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* @return The module object
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*/
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extern "C" MXS_MODULE* MXS_CREATE_MODULE()
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{
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static MXS_MODULE info =
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{
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MXS_MODULE_API_MONITOR,
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MXS_MODULE_GA,
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MXS_MONITOR_VERSION,
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"A Group Replication cluster monitor",
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"V1.0.0",
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MXS_NO_MODULE_CAPABILITIES,
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&maxscale::MonitorApi<GRMon>::s_api,
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NULL, /* Process init. */
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NULL, /* Process finish. */
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NULL, /* Thread init. */
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NULL, /* Thread finish. */
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{
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{MXS_END_MODULE_PARAMS}
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}
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};
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return &info;
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}
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